[bert]

——Fill it with gasoline and light it up——

Using chlorine or a derivative would be illegal gas attack

By dumping a lot of gasline, but not filling the tunnel and then using a big fan to blow the vapors into the tunnel and then igniting would be legal.

That is how I kill yellow jackets

[lightman]

That is how I kill yellow jackets

So do I...but I've never ignited!

[BTerclinger]

Sounds about right!